Pharmaceutical compositions

ABSTRACT

Pharmaceutical compositions are provided which comprise effective amounts of analgesic to treat a subject, including to reduce or eliminate an adverse effect associated with the analgesic.

CROSS-REFERENCE

This application claims the benefit of U.S. Provisional Applications No. 60/850,451 filed Oct. 9, 2006, 60/921,563, filed Apr. 3, 2007, and 60/948,375 filed Jul. 6, 2007, which are incorporated herein by reference.

BACKGROUND OF THE INVENTION

Available pain medications may have adverse effects such as nausea, vomiting, and skin rashes. While such medications may be effective in providing pain relief, many subjects are unable to tolerate recommended dosages needed for effective pain relief because of adverse effects. Accordingly, there remains a need for effective analgesics with reduced adverse effects within the art of analgesic compositions.

SUMMARY OF THE INVENTION

In general the invention comprises methods and compositions designed to treat a subject with a drug formulation comprising multiple active agents.

In one aspect of the invention a composition comprises, an opioid analgesic, a non-opioid analgesic agent, an agent that reduces or eliminates a adverse effect of an opioid analgesic agent and a pharmaceutically acceptable carrier or vehicle.

The invention also relates to methods for treating pain comprises administering to a subject in need thereof an effective amount of an opioid analgesic agent, a non-opioid analgesic agent and an agent that reduces or eliminates a adverse effect of an opioid analgesic agent. For example, the agent which reduces adverse effects is an anti-emetic agent or antihistamine.

The invention further relates to pharmaceutical compositions comprising from 1% to 20% by weight of an antihistamine; from 10% to 80% by weight a non-opioid analgesic; and from 1% to 20% by weight of an opioid analgesic. In a further aspect, a pharmaceutical composition comprises an opioid analgesic, a non-opioid analgesic and an antihistamine, wherein the relative ratio of said opioid analgesic, said non-opioid analgesic and said antihistamine is from 1 to 2:40 to 45:1 to 2 respectively.

The invention also relates to, pharmaceutical compositions comprising an opioid analgesic, a non-opioid analgesic and an antihistamine, which is designed to provide a plasma concentration of said antihistamine at a substantially greater rate than said opioid and said non-opioid analgesic.

In another aspect of the invention, a method of treating a subject to alleviate any condition which could benefit from administering an effective amount of a pharmaceutical composition comprising an opioid analgesic, a non-opioid analgesic and an antihistamine. In one embodiment, the condition is a adverse effect associated with administration of an opioid analgesic.

The invention further relates to methods for treating a subject suffering from or susceptible to pain, comprises administering to said subject a pharmaceutical composition comprising an effective amount of a first component which is a non-opioid analgesic, or a pharmaceutically acceptable salt thereof; a second component which is a non-opioid analgesic, or a pharmaceutically acceptable salt thereof; and an effective amount of a third component which is an antihistamine.

INCORPORATION BY REFERENCE

All publications and patent applications mentioned in this specification are herein incorporated by reference to the same extent as if each individual publication or patent application was specifically and individually indicated to be incorporated by reference.

SUMMARY OF THE DRAWINGS

FIG. 1. illustrates the chemical structure of hydrocodone bitartrate. It is an opioid analgesic and antitussive and occurs as fine, white crystals or as a crystalline powder. The chemical name is: 4,5α-epoxy-3-methoxy-17-methylmorphinan-6-one tartrate (1:1) hydrate (2:5). The chemical formula is C₁₈H₂₁NO₃.C₄H₆O₆.212 H₂O; M.W.=494.50.

FIG. 2. illustrates the chemical structure of oxycodone hydrochloride.

FIG. 3. illustrates the chemical structure of acetaminophen, 4′-hydroxyacetanilide. It is a slightly bitter, white, odorless, crystalline powder, and a non-opioid, non-salicylate analgesic and antipyretic. The chemical formula is C₈H₉NO₂; M.W.=151.16.

FIG. 4. illustrates the chemical structure of promethazine

DETAILED DESCRIPTION OF THE INVENTION

The present invention is generally directed to compositions comprising of multiple active agents that are useful as therapeutics that alleviate, abate or eliminate an adverse effect associated with opioid and/or non-opioid anagesic agents. In various embodiments of the invention a composition comprises an effective amount of two actives, an effective amount of three active agents, an effective amount of four active agents, an effective amount of five active agents or more than five active agents. An active agent is selected from various classes of drugs, including but not limited to opioid analgesics, non-opioid analgesics, decongestant, expectorant, mucus thinning drugs, antitussives, antihistamines or a combination thereof.

Various aspects of the invention are directed to compositions comprising an analgesic (e.g., one analgesic or two, three or more analgesics) and an adverse-effect-reducing active agent (e.g., an antihistamine or antiemetic). Such analgesics can include one or more opioid analgesics, or one or more non-opioid analgesics. In various further embodiments the compositions comprise an antihistamine, or an antiemetic.

In one aspect, a pharmaceutical composition is provided comprising, an effective amount of an opioid analgesic, an effective amount of non-opioid analgesic agent, and an effective amount of an agent that reduces or eliminates an adverse effect of said analgesic agents. In one embodiment, the agent that reduces or eliminates an adverse effect is an antiemetic agent or antihistamine. In further embodiments, the adverse effect reduced or eliminated is associated with an opioid analgesic. In one embodiment, the adverse effect is associated with a non-opioid analgesic.

In some embodiments, the agent which reduces or eliminates a adverse effect of an opioid analgesic agent is promethazine, dolasetron, granisetron, ondansetron, tropisetron, palonosetron, domperidone, droperidol, haloperidol, chlorpromazine, prochloperazine, metoclopramide, alizapride, cyclizine, diphenhydramine, dimenhydrinate, meclizine, hydroxyzine, cannabis, dronabinol, nabilone, midazolam, lorazepam, hyoscine, dexamethasone, trimethobenzamide, emetrol and propofol.

In one embodiment, a composition of the invention comprises a non-opioid analgesic agent which is acetaminophen or ibuprofen.

In one embodiment, the opioid analgesic agent is hydrocodone or oxycodone, or a pharmaceutically acceptable salt, thiosemicarbazone, p-nitrophenylhydrazone, o-methyloxime, semicarbazone, or bis(methylcarbamate) (each of the foregoing being an opioid analgesic agent or derivative). In a further embodiment, the opioid analgesic agent is hydrocodone bitartrate or oxycodone hydrochloride.

In one aspect of the invention, the pharmaceutical composition is in the form of a multi-layered tablet, such as in the form of a bi-layered tablet. In one embodiment, the bi-layered tablet comprises: (a) an inner, immediate-release layer that comprises the agent that reduces or eliminates a adverse effect of an opioid analgesic; and (b) an outer, controlled-release layer that comprises the agent that reduces or eliminates a adverse effect of an opioid analgesic, the opioid analgesic agent and the non-opioid analgesic agent.

In one embodiment, a pharmaceutical composition is provided comprising an opioid analgesic, a non-opioid analgesic and an antihistamine, wherein said composition is capable of providing a plasma concentration of said antihistamine at a substantially sooner than plasma concentrations of said opioid and said non-opioid analgesic are achieved post administration. For example, a pharmaceutical composition comprising three active agents—opioid analgesic, non-opioid analgesic, and antihistamine or antiemetic—will provide a plasma concentration of the latter antihistamine or aniemetic at about 1 to about 20 minutes, which is substantially faster than providing the an analgesic, which can be provided in about 30 minutes to about 12 hours.

In various embodiments, a pharmaceutical composition is provided comprising from 1% to 20% by weight of an antihistamine; from 10% to 80% by weight a non-opioid analgesic; and from 1% to 20% by weight of an opioid analgesic.

In one embodiment, the composition is capable of increasing a plasma concentration of said antihistamine in about 1 minute to about 20 minutes after administration to a subject.

In some embodiments, the antihistamine is selected from a group consisting of promethazine, dolasetron, granisetron, ondansetron, tropisetron, palonosetron, domperidone, droperidol, haloperidol, chlorpromazine, prochloperazine, metoclopramide, alizapride, cyclizine, diphenhydramine, dimenhydrinate, meclizine, hydroxyzine, cannabis, dronabinol, nabilone, midazolam, lorazepam, hyoscine, dexamethasone, trimethobenzamide, emetrol and propofol.

In one aspect of the invention, a method is provided for treating a subject in need thereof, comprising administering to a subject in need thereof an effective amount of a pharmaceutical composition comprising an opioid analgesic agent, a non-opioid analgesic agent and an agent which reduces or eliminates a adverse effect of said analgesic agents.

In one embodiment, a method is provided for treating a subject suffering from or susceptible to pain, comprising administering to said subject a pharmaceutical composition comprising an effective amount of a first agent which is a non-opioid analgesic, or a pharmaceutically acceptable salt thereof; an effective amount of a second agent which is a non-opioid analgesic, or a pharmaceutically acceptable salt thereof; and an effective amount of a third agent which reduces a adverse effect associated with said analgesics.

In some embodiments, the agent for reducing or eliminating a adverse effect is promethazine, dolasetron, granisetron, ondansetron, tropisetron, palonosetron, domperidone, droperidol, haloperidol, chlorpromazine, prochloperazine, metoclopramide, alizapride, cyclizine, diphenhydramine, dimenhydrinate, meclizine, hydroxyzine, cannabis, dronabinol, nabilone, midazolam, lorazepam, hyoscine, dexamethasone, trimethobenzamide, emetrol or propofol.

The pharmaceutical composition can be in any form disclosed herein, such as a multi-layered tablet (e.g., a bi-layered tablet). In one embodiment, the multi-layered tablet is a bi-layered tablet that comprises: (a) an outer, immediate-release layer that comprises an agent which reduces or eliminates a adverse effect of an opioid analgesic; and (b) an inner, controlled release layer that comprises, an opioid analgesic agent and a non-opioid analgesic agent.

adverse effect. In one embodiment, the agent (e.g., promethazine) reducing or eliminating adverse effects is released at a substantially greater rate than an opioid or non-opioid analgesic comprised in a pharmaceutical composition of the invention, as further described herein. For example, a plasma concentration of the agent that reduces or eliminates an adverse effect of an opioid analgesic is achieved in about 1 minute to about 20 minutes, as compared to an analgesic plasma concentration provided in about 30 minutes to about 8 hours. In various embodiments, the pharmaceutical composition of the invention comprises an agent that reduces or eliminates an adverse effect which agent is released in at least about 1 minute to at least about 20 minutes. In one embodiment, such an agent is an antihistamine or antiemetic. In various embodiments, such an agent is promethazine, dolasetron, granisetron, ondansetron, tropisetron, palonosetron, domperidone, droperidol, haloperidol, chlorpromazine, procbloperazine, metoclopramide, alizapride, cyclizine, diphenhydramine, dimenhydrinate, meclizine, hydroxyzine, cannabis, dronabinol, nabilone, midazolam, lorazepam, hyoscine, dexamethasone, trimethobenzamide, emetrol or propofol.

In one embodiment, a pharmaceutical composition comprises an opioid analgesic agent, a non-opioid analgesic agent, and an agent useful for preventing and/or suppressing an adverse effect associated with the opioid and/or non-opioid analgesic. An adverse effect of an opioid and/or non-opioid analgesic includes but is not limited to nausea, vomiting, other gastric upsets, skin rashes, allergic reactions such as swelling, difficulty breathing, closing of throat, abdominal pain, unusual bleeding or bruising and skin rashes or skin rashes. In one embodiment, an averse effect(s) reduced or eliminated is associated with an opioid analgesic including but not limited to nausea, vomiting, constipation or a combination thereof.

In a further embodiment, the opioid analgesic agent is, for example, hydrocodone, oxycodone or fentanyl; the non-opioid analgesic agent is, for example, acetaminophen, ibuprofen, ketaprofen, naproxen, or aspirin; and the agent useful for preventing and/or suppressing a adverse effect is, for example, an antihistamine such as promethazine.

In another embodiment a composition comprises an analgesic agent, an antitussive agent, and an agent useful for preventing and/or suppressing a adverse effect of the analgesic agent and/or the antitussive agent. Of course, under some circumstances an antitussive is also an analgesic.

Thus in some embodiments the composition comprises acetaminophen, hydrocodone or oxycodone; the antitussive agent is, for example, dikasetron, domperidone, meclizine, dronabinol, a benzodiazepine, an anticholinergic, hydrocodone or oxycodone; the agent useful for preventing and/or suppressing adverse effect is, for example, an antihistamine such as promethazine.

Another embodiment of the invention is directed to a pharmaceutical composition, comprising an opioid analgesic agent, an non-opioid analgesic agent, and an antiemetic agent.

In a further embodiment of this invention, the opioid analgesic agent is, for example, hydrocodone, oxycodone; the non-opioid analgesic agent is, for example, acetaminophen, ibuprofen, ketaprofen, naproxen, or aspirin; the antiemetic agent is, for example 5-HT₃ receptor antagonists, a dopamine antagonist, an antihistamine, a cannabinoid, benzodiazepines, an anticholinergic, wherein all or less than all of the total amount of the antimetic agent is formulated for immediate release.

Another embodiment of this invention is directed to methods for the treatment of pain, comprising administering an effective amount of an opioid analgesic agent, a non-opioid analgesic agent and an agent useful for preventing and/or suppressing, reducing or eliminating a adverse effect of the opioid analgesic agent to a subject in need thereof. The methods allow for use of analgesics in populations at risk of adverse effect such as nausea, vomiting, other gastric upsets, skin rashes, allergic reactions such as swelling, difficulty breathing, closing of throat, abdominal pain, unusual bleeding or bruising and skin rashes. The opioid analgesics include, for example, hydrocodone, hydrocodone bitartrate, pharmaceutically acceptable salts and complexes of hydrocodone, oxycodone, oxycodone HCl, pharmaceutically acceptable salts and complexes of oxycodone. The non-opioid analgesics include, for example, acetaminophen, ibuprofen, ketaprofen, naproxen, or aspirin. The agents are useful for reducing or eliminating adverse effectadverse effects, such as, for example, promethazine, promethazine analogue, pharmaceutically acceptable salts and complexes of promethazine, or combinations of these compounds.

In one aspect of the invention, the pharmaceutical composition comprises an opioid analgesic, a non-opioid analgesic and an antihistamine, wherein said composition provides a plasma concentration of said antihistamine at a substantially greater rate than said opioid and said non-opioid analgesic. In one embodiment the antihistamine is formulated for immediate-release. In another embodiment the opioid analgesic and/or the non-opioid analgesic is/are formulated for controlled-release. In one embodiment the composition is capable of increasing a plasma concentration of said antihistamine immediately after administration to a subject. In this embodiment increased a plasma concentration of said antihistamine occurs from about 1 minute to about 20 minutes after administration.

Another aspect of the invention comprises a method of treating a subject to alleviate pain, comprising administering an effective amount of a pharmaceutical composition comprising an opioid analgesic, a non-opioid analgesic and an antihistamine. In one embodiment, the antihistamine is formulated for immediate release.

In various embodiments, a dosage form of the invention provides an increased plasma concentration of said antihistamine occurs from about 1 minute to about 20 minutes after administration, such as about 1 min, 2 min, 3 min, 4 min, 5 min, 6 min, 7 min, 8 min, 9 min, 10 min, 11 min, 12 min, 13 min, 14 min, 15 min, 16 min, 17 min, 18 min, 19 min, 20 min, 21 min, 22 min, 23 min, 24 min, 25 min. In some embodiments, the release rate occurs at substantially faster as compared to release rates for the analgesic agents. Therefore, after administration to a subject, the antihistamine (e.g., promethazin dolasetron, granisetron, ondansetron, tropisetron, palonosetron, domperidone, droperidol, haloperidol, chlorpromazine, prochloperazine, metoclopramide, alizapride, cyclizine, diphenhydramine, dimenhydrinate, meclizine, hydroxyzine, cannabis, dronabinol, nabilone, midazolam, lorazepam, hyoscine, dexamethasone, trimethobenzamide, emetrol and propofol) is released and a plasma concentration of an antihistamine is provided before release of the opioid and/or non-opioid analgesic.

In some embodiments, a dosage form of the invention provides a plasma concentration of said opioid analgesic and/or said non-opioid analgesic occurs from about 1 hour to about 4 hours after administration, such as about 1 hr, 1.2 hrs, 1.4 hrs, 1.6 hrs, 1.8 hrs, 2.0 hrs, 2.2 hrs, 2.4 hrs, 2.6 hrs, 2.8 hrs, 3.0 hrs, 3.2 hrs, 3.4 hrs, 3.6 hrs, 3.8 hrs, 4.0 hrs, 5.0 hrs, 6.0 hrs, 7.0 hrs, 8.0 hrs, 9.0 hrs, 10.0 hrs, 11.0 hrs, 12.0 hrs, 13.0 hrs, 14.0 hrs, 15.0 hrs, 16.0 hrs, 17.0 hrs, 18.0 hrs, 19.0 hrs, 20.0 hrs, 21.0 hrs, 22.0 hrs, 23.0 hrs, or 24.0 hrs. In further embodiments, the opioid or non-opioid analgesic are present from about 1 hour to 24 hour, 1 day to 30 days, including but not limited to 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 12, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29 or 30 days. For example, administration of dosage compositions can be effected through patch delivery systems which are known.

Another aspect of the invention comprises a method of treating a subject to alleviate a condition comprising administering a therapeutically effective amount of a pharmaceutical composition comprising an opioid analgesic, a non-opioid analgesic and an antihistamine. In one embodiment, the antihistamine is formulated for immediate release.

In another embodiment, a plasma concentration of said antihistamine occurs from about 1 minute to about 20 minutes after administration. In an additional embodiment, a plasma concentration of an opioid analgesic and/or non-opioid analgesic is achieved from about 1 hour to about 8 hours after administration.

In one embodiment subjects receiving opioid analgesics and acetaminophen concomitantly with, antihistamines, antipsychotics, antianxiety agents, or other CNS depressants is given a reduced dosage of one or more agents to prevent or ameliorate any additive effects, such as CNS depression. In another embodiment the dosage of one or more of the agents is adjusted according to the severity of the pain and the response of the subject.

In subjects with terminal diseases or chronic conditions pain management can be of a primary concern to the subject's quality of life. In some of these subjects tolerance to opioid analgesics can develop with continued use. In one embodiment, adjustments are made to the amounts or time release characteristics of the components in a composition, comprising an opioid analgesic, a non-opioid analgesic and an antihistamine. In this embodiment the adjustments are designed to provide pain relief to a subject with tolerance to opioid analgesics. In one embodiment the amount of the opioid analgesic may be increased in the composition to be adminstered to a subject. In another embodiment the time release characteristics of the opioid analgesic may be adjusted so as to change the ratio of immediate-release opioid analgesic to controlled-release opioid analgesic.

In one embodiment of the present invention, the pharmaceutical compositions comprises: hydrocodone in a dosage range of between about 1.0 mg to about 15 mg or oxycodone in a dosage range of between about 1.0 mg to about 200 mg; acetaminophen in a dosage range of between about 200 mg to about 600 mg; and, promethazine in a dosage range of between about 0.5 mg to about 60.0 mg.

In another embodiment of the present invention, the pharmaceutical compositions comprise about 7.5 mg of hydrocodone, about 325 mg of acetaminophen, and about 12.5 mg of promethazine.

In another embodiment of the present invention, the pharmaceutical compositions comprise about 7.5 mg of oxycodone, about 325 mg of acetaminophen, and about 12.5 mg of promethazine.

In another embodiment of the present invention, the pharmaceutical compositions comprise an effective amount of hydrocodone or oxycodone HCl, an effective amount of acetaminophen, and an effective amount of promethazine in a single, oral pill or tablet form having dosage levels that can be safely doubled for combating severe pain.

In a further embodiment of the present invention, all or less than all of the total amount of the promethazine is formulated for immediate release into the subject's blood stream.

In a further embodiment of the present invention, all or less than all of the total amount of the hydrocodone or oxycodone is formulated for controlled-release into the subject's body.

In various embodiments of the present invention, the agents are formulated as oral dosage forms, inhalations, nasal sprays, patches, absorbing gels, liquids, liquid tannates, suppositories, injections, I.V. drips, other delivery methods, or a combination thereof to treat subjects.

In another embodiment of the present invention, the agents are formulated as single oral dosage forms such as tablets, capsules, cachets, soft gelatin capsules, hard gelatin capsules, extended release capsules, tannate tablets, oral disintegrating tablets, multi-layer tablets, beads, liquids, oral suspensions, chewable lozenges, oral solutions, oral syrups, sterile packaged powder including pharmaceutically-acceptable excipients, other oral dosage forms, or a combination thereof.

In another embodiment of the present invention, the pharmaceutical compositions comprise an agent in immediate release, quick release, controlled release, sustained release, extended release, other release formulations or patterns, or a combination thereof.

In one aspect, a composition of the invention comprises three active agents each of which is selected from a decongestant, an antitussive, an expectorant, a mucus thinning drugs, an analgesic and an antihistamine.

For example, in one embodiment an agent is an antitussive such as, e.g., codeine, dihydrocodeine, hydrocodone, dextromethorphan and a pharmaceutically acceptable salt thereof; another agent is a decongestant such as, e.g., phenylephrine, pseudoephedrine and a pharmaceutically acceptable salt thereof, and another agent is an expectorant. One will recognize that an active agent may fit into more than one category (e.g., hydrocodone is an antitussive and opioid analgesic).

In another embodiment, a composition of the invention comprises an effective amount of an opioid analgesic (e.g., hydrocodone or oxycodone), a non-opioid analgesic (e.g., acetaminophen or ibuprofen), and an antihistamine (e.g., promethazine). In a further embodiment, the composition comprises an effective amount of hydrocodone, acetaminophen and promethazine. In yet a further embodiment, the composition comprises an effective amount of oxycodone, acetaminophen and promethazine.

In any of the embodiments disclosed herein, a composition of the invention can be administered using one or more different dosage forms which are further described herein.

In other aspects of the invention, a composition of the invention is administered in various dosage forms. For example, a composition comprising multiple active agents can be administered in solid, gel, patch or liquid form. Such dosage forms are further described herein. Examples of such dosage forms are known, such as tablet forms disclosed in U.S. Pat. Nos. 3,048,526, 3,108,046, 4,786,505, 4,919,939, 4,950,484; gel forms disclosed in U.S. Pat. Nos. 4,904,479, 6,482,435, 6,572,871, 5,013,726; patches for delivery of pharmaceutical compositions such as disclosed in U.S. Pat. Nos. 5,741,510, 4,624,665, 4,626,539, 4,834,978, 6,469,227, 5,919,479, 6,261,595, 6,303,142, 6,341,387, 6,465,006, 6,613,350, 6,780,426, 7,094,228, 6,756,053; capsule forms disclosed in U.S. Pat. Nos. 4,800,083, 4,532,126, 4,935,243, 6,258,380; liquid forms disclosed in U.S. Pat. Nos. 4,625,494, 4,478,822, 5,610,184; or I.V. forms disclosed in U.S. Pat. Nos. 4,871,353, 4,925,444, 5,484,406; each of which is incorporated herein by reference in its entirety.

In other aspects of the invention, a composition of the invention is administered at various dosages and/or has various release rates (e.g., controlled release or immediate release).

Immediate release refers to the release of an active agent substantially immediately upon administration. In one embodiment, immediate release results in dissolution of an agent within 1-20 minutes after entering the stomach. Dissolution can of all or less than all of the active. For example, dissolution of 100% of an agent (antihistamine or antiemetic) can occur in the prescribed time. Alternatively, dissolution of less than all of the agent can occur in about 1 minute to about 20 minutes (e.g., dissolution of about 70%, about 75%, about 80%, about 85%, about about 90%, about 91%, about 92%, about 93%, about 94%, about 95%, about 96%, about 97%, about 98%, about about 99%, about 99.5% or 99.9% of an agent).

In another embodiment, immediate release occurs when there is dissolution of an agent within 1-20 minutes after administration. In another embodiment, immediate release results in substantially complete dissolution within about 1 hour following administration.

In various embodiments, immediate release occurs when there is dissolution of an agent within 1-20 minutes after administration. Dissolution can be in a subject's stomach and/or intestine. In another embodiment, immediate release results in complete or less than complete dissolution within about 1 hour following administration to a subject. In another embodiment, immediate release results in complete or less than complete dissolution within about 1 hour following rectal administration. Immediate release components can also be referred to as instant release. When used in association with the dissolution profiles discussed herein, the term “immediate release” refers to wherein all or less than all of the total amount of a dosage form is dissolved. In some embodiments, immediate release is through inhalation, such that dissolution occurs in a subject's lungs, as further described herein. Dissolution of less than all of an active includes but is not limited to dissolution of about 50%, 60%, 70%, 80%, 85%, 90%, 95%, 97%, 98%, 99%, 99.1%, 99.2%, 99.35, 99.4%, 99.5%, 99.6%, 99.7%, 99.8% or 99.99% of the active.

Controlled-release, or sustained-release, refers to the release of an agent such as a drug or drug component from a composition or dosage form in which the agent is released according to a desired profile over an extended period of time. In one embodiment, controlled-release results in dissolution of an agent within 20-180 minutes after entering the stomach. In another embodiment, controlled-release occurs when there is dissolution of an agent within 20-180 minutes after being swallowed. In another embodiment, controlled-release occurs when there is dissolution of an agent within 20-180 minutes after entering the intestine. In another embodiment, controlled-release results in substantially complete dissolution after at least 1 hour following administration. In another embodiment, controlled-release results in substantially complete dissolution after at least 1 hour following oral administration. In another embodiment, controlled-release results in substantially complete dissolution after at least 1 hour following rectal administration. For example, controlled release compositions allow delivery of an agent to a subject over an extended period of time according to a predetermined profile. Such release rates can provide therapeutically effective levels of agent for an extended period of time and thereby provide a longer period of pharmacologic or diagnostic response as compared with conventional rapid release dosage forms. Such longer periods of response provide for many inherent benefits that are not achieved with immediate release dosages. In using analgesics for treatments of chronic pain, controlled release formulations can be preferred over conventional short-acting formulations. When used in association with the dissolution profiles discussed herein, the term “controlled-release” refers to wherein all or less than all of the total amount of a dosage form, made according to the present invention, delivers an active agent over a period of time greater than 1 hour.

When present in a controlled-release oral dosage form, the compositions of the present invention can be dosed at a substantially lower daily dosage level than conventional immediate release products. At comparable daily dosage levels, the controlled release oral solid dosage forms can provide greater in pain relief than conventional immediate release products.

Combination Formulations

Various aspects of the invention are directed to compositions comprising an effective amount of an analgesic and an active agent that is useful for reducing an adverse effect associated with such one or more opioid analgesics, and/or one or more non-opioid analgesic. Such additional active agents include anitemetics and antihistamines. In some embodiments, the analgesics are opioid or non-opioid analgesics (e.g., hydrocodone or oxycodone and acetaminophen). In a further embodiment, the active agent which reduces adverse effects of such analgesics is promethazine.

In one embodiment, a pharmaceutical composition of the invention, by reducing adverse effects associated with an opioid and/or non-opioid analgesic allows for higher dosages for said analgesics in the pharmaceutical composition. For example, in a subject who could not otherwise tolerate a certain dosage of an opioid analgesic, a pharmaceutical composition of the invention comprising an opioid analgesic, a non-opioid analgesic and promethazine, will reduce the adverse effects (e.g. nausea, vomiting) associated with the analgesic, thus allowing for increased dosages to be administered. Furthermore, administration would be through a single composition.

In various embodiments, the analgesic agent of the multidrug composition comprises, an opioid analgesic such as hydrocodone, oxycodone, morphine, diamorphine, codeine, pethidine, alfentanil, buprenorphine, butorphanol, codeine, dezocine, fentanyl, hydromorphone, levomethadyl acetate, levorphanol, meperidine, methadone, morphine sulfate, nalbuphine, oxycodone, oxymorphone, pentazocine, propoxyphene, remifentanil, sufentanil, or tramadol; and an opioid an antagonists such as nalmefene, naloxone, or naltrexone. The composition can further comprise antitussives such as codeine or dextromethorphan.

In some embodiments, a composition of the invention comprises an opioid and non-opioid analgesic such as: codeine/acetaminophen, codeine/aspirin, hydrocodone/acetaminophen, hydrocodone/ibuprofen, oxycodone/acetaminophen, oxycodone/aspirin, or propoxyphene/aspirin or acetaminophen.

Therefore, in some embodiments, a composition comprises an analgesic and an active agent useful for reducing or eliminating adverse effects, such as an antihistamine (e.g., promethazine) and/or an antiemetic, as described herein.

In other embodiments the composition comprises an opioid, a non-opioid analgesic, and an antihistamine (e.g., promethazine).

For example, in one embodiment, a composition comprises an opioid and/or non-opioid analgesic and promethazine. In further embodiments, the composition further comprises an anti-emetic. In yet further embodiments, one or more additional adverse-effect-reducing active agents can be administered separately (concurrently, before, after, administration of a multi-drug composition). In addition, any of the compositions of the invention, can comprise a non-opioid analgesic or an opioid analgesics.

Examples of non-opioid analgesics useful in the compositions of the invention include but are not limited to acetaminophen; a non-steroidal anti-inflammatory drug (NSAID) such as a salicylate (including, for example, amoxiprin, benorilate, choline magnesium salicylate, diflunisal, faislamine, methyl salicylate, magnesium salicylate), an arylalkanoic acid (including, for example, diclofenac, aceclofenac, acemetacin, bromfenac, etodolac, indometacin, nabumetone, sulindac, tolmetin), a profen (including, for example, ibuprofen, carprofen, fenbuprofen, flubiprofen, ketaprofen, ketorolac, loxoprofen, naproxen, suprofen), a fenamic acid (including, for example mefenamic acid, meclofenamic acid), an oxicam (including, for example, piroxicam, lomoxicam, meloxicam, tenoxicam), a pyrazolidine derivative (including, for example, phenylbutazone, azapropazone, metamizole, oxyphenbutazone, sulfinprazone); and a synthetic drug having narcotic properties such as tramadol.

Each agent is useful as its free base, where applicable or its pharmaceutically acceptable salt, prodrug, analog and complex. Pharmaceutically acceptable salts include bitartrate, bitartrate hydrate, hydrochloride, p-toluenesulfonate, phosphate, sulfate, trifluoroacetate, bitartrate hemipentahydrate, pentafluoropropionate, hydrobromide, mucate, oleate, phosphate dibasic, phosphate monobasic, acetate trihydrate, bis(heptafluorobutyrate), bis(pentafluoropropionate), bis(pyridine carboxylate), bis(trifluoroacetate), chlorhydrate, and sulfate pentahydrate. In one embodiment the agent is hydrocodone, a pharmaceutically acceptable salt or its thiosemicarbazone, p-nitrophenylhydrazone, o-methyloxime, semicarbazone, or bis(methylcarbamate). In another embodiment the agent is oxycodone, a pharmaceutically acceptable salt or its thiosemicarbazone, p-nitrophenylhydrazone, o-methyloxime, semicarbazone, or bis(methylcarbamate). In a further embodiment the agent is acetaminophen, a pharmaceutically acceptable salt or its thiosemicarbazone, p-nitrophenylhydrazone, o-methyloxime, semicarbazone, or bis(methylcarbamate). In another embodiment an agent is promethazine, a pharmaceutically acceptable salt or its thiosemicarbazone, p-nitrophenylhydrazone, o-methyloxime, semicarbazone, or bis(methylcarbamate).

The agent useful for treating a subject, such as by preventing or alleviating an adverse effect includes, for example, an antihistamine including a histamine agonist and an antagonist which is classified according to receptor subtype. H1 agonists or partial agonists include 2-(m-fluorophenyl)-histamine, and H1 antagonists include chlorpheniramine, scopolamine, mepyramine, terfenadine, astemizole, and triprolidine. Further antagonists (which may be further classified by their chemical structures) include the ethanolamines carbinoxamine, dimenhydrinate, diphenhydramine, and doxylamine; the ethylaminediamines pyrilamine and tripelennamine; the piperazine derivatives dydroxyzine, cyclizine, fexofenadine and meclizine; the alkylamines brompheniramine and chlorpheniramine; and miscellaneous antagonists cyproheptadine, loratadine, cetrizine. H2 agonists include dimaprit, impromidine, and amthamine; and H2 antagonists (useful in the treatment of gastric acid secretion) include cimetidine, ranitidine, nizatidine, and famotidine; H3 agonists include R-alpha-methylhistamine, imetit, and immepip and H3 antagonists include thioperamide, iodophenpropit, and clobenpropit; and H4 agonists include clobenpropit, imetit, and clozapine and H4 antagonists include thioperamide. The agent useful for preventing or suppressing a adverse effect can also include an H1 blocker, such as azelastine, brompheniramine, buclizine, carbinoxamine, cetrizine, chlorpheniramine, clemastine, cyclizine, cyproheptadine, desloratidine, dimenhydrinate, diphenhydramine, emedastine, fexofenadine, hydroxyzine, ketotifen, levocabastine, loratadine, meclizine, olopatadine, phenindamine, and promoathazine.

In various embodiments of compositions comprising two, three, four, five or more active agents, at least one of the active agents is an antihistamine. In a further embodiment, the antihistamine is promethazine. In yet further embodiments, the promethazine is formulated for immediate release, controlled-release, delayed release or a combination thereof (e.g., some dosage amount for immediate release some dosage controlled/delayed release).

The compositions can comprise an antiemetic agent including, for example, promethazine, dolasetron, granisetron, ondansetron, tropisetron, palonosetron, domperidone, droperidol, haloperidol, chlorpromazine, prochloperazine, metoclopramide, alizapride, cyclizine, diphenhydramine, dimenhydrinate, meclizine, hydroxyzine, cannabis, dronabinol, nabilone, midazolam, lorazepam, hyoscine, dexamethasone, trimethobenzamide, emetrol, propofol, or the like.

The composition can comprise an antitussive agent including, for example, dextromethorphan, noscapine, ethyl morphine, codeine, camphor, menthol, theobromine, guaifenesin, or the like.

Therefore in various embodiments of the invention, a composition comprises at least two analgesics; and one antihistamine or antiemetic. For example, in one embodiment, a composition comprises hydrocodone, acetaminophen and promethazine. In another embodiment, a composition comprises oxycodone, acetaminophen and promethazine.

Administration

One aspect of the present invention provides a method for preventing an adverse effect such as nausea, vomiting, other gastric upsets, skin rashes, allergic reactions such as swelling, difficulty breathing, closing of throat, abdominal pain, unusual bleeding or bruising and skin rashes in a subject receiving or in need of opioid analgesic therapy by the administration of acetaminophen or other non-opiod analgesic and promethazine or other antihistamine with the chosen opioid analgesics. Accordingly, the invention provides methods for treating pain, comprising administering to a subject in need thereof an effective amount of an opioid analgesic agent, a non-opioid analgesic agent and an agent that reduces side affects of the opioid analgesic agent. In one embodiment, the non-opioid analgesic agent is acetaminophen. In another embodiment, the agent that reduces a adverse effect is promethazine. The administration can continue for only a relatively short time in the case of an acute condition requiring opioid therapy or for long periods in the case of conditions requiring chronic use of opioid analgesics. The dosing of analgesics can be dependent upon the condition being treated, the subject's individual perception of pain and the use of the opioid on a set time schedule as a prophylactic to prevent the onset of pain or on an as needed basis in response to perceived pain. The choice of selecting a dosage of a composition that contains suitable amount of promethazine can be dependent upon the extent and severity of the adverse effects including nausea, vomiting, other gastric upsets, skin rashes, allergic reactions such as swelling, difficulty breathing, closing of throat, abdominal pain, unusual bleeding or bruising and skin rashes in a subject, upon the sensitivity to side-effect-reducing compounds such as promethazine in a subject, upon the likelihood of subject losing medication by vomiting, and/or on an as needed basis in response to perceived adverse effects. The dosage can be assessed by a prescribing professional evaluating the subject, the condition treated, the analgesic to be used, diet and the expected duration of therapy.

In one embodiment, the present invention provides for a method for treating a subject suffering from or susceptible to pain, comprising administering to said subject a pharmaceutical composition comprising an effective amount of a first component which is a non-opioid analgesic, or a pharmaceutically acceptable salt thereof, an effective amount of a second component which is a non-opioid analgesic, or a pharmaceutically acceptable salt thereof and and an effective amount of a third component which is an antihistamine.

In another embodiment, a method for treating a subject is provided comprising administering a pharmaceutical composition comprising: an effective amount of a first agent which is a non-opioid analgesic, or a pharmaceutically acceptable salt thereof; an effective amount of a second agent which is an opioid analgesic, or a pharmaceutically acceptable salt thereof; and an effective amount of a third component which is an antihistamine. In one embodiment the at least one adverse effect is selected from the group consisting of nausea, vomiting, other gastric upsets, skin rashes, allergic reactions such as swelling, difficulty breathing, closing of throat, abdominal pain, unusual bleeding or bruising and skin rashes. In one embodiment the non-opioid analgesic is acetaminophen or analogue thereof. In one embodiment, the antihistamine is promethazine. In one embodiment, the opioid analgesic is hydrocodone. In another embodiment the opioid analgesic is oxycodone.

In another embodiment, the present invention provides for a method for preventing a adverse effect such as nausea, vomiting, and a skin rash in a subject receiving or in need of opioid therapy by the administration of acetaminophen or analogue thereof and promethazine with the opioid analgesic. In one embodiment, the opioid analgesic is hydrocodone. In another embodiment the opioid analgesic is oxycodone. In one embodiment, administration of a composition comprising a non-opioid analgesic and an antihistamine enhances the reduction or elimination of adverse effects associated with an opioid analgesic. For example, addition of promethazine and acetaminophen/ibuprofen reduces or eliminates an adverse effect associated with an opioid analgesic in a synergistic manner.

It is believed that administration of a composition of the invention would result in treatment of the subject which includes elimination or reduction of an adverse effect associated with analgesics (e.g., opioids) and enhance the beneficial uses of such analgesics. Such an adverse effect can otherwise render administration of certain analgesics intolerable, due to for example vomiting, nausea, and skin rashes. Therefore, various embodiments of the methods of the invention are directed to target populations of subjects that are susceptible to such an adverse effect(s), thus allowing such subjects to benefit from the pain-alleviating effects of analgesic-based pain relief, administration of which would otherwise be intolerable.

For example, by reducing the risk of vomiting, the risk of subject losing the analgesics (and losing the pain-relieving beneficial effects of analgesics) by vomiting is minimized. Furthermore, administration can be adjusted to provide the dose of side-effect-reducing compound to match the subject's analgesic ingestion without separate intervention by the health care professionals. Adding one or more additional active agents, such as promethazine, to the present compositions is believed to result in a composition having reduced potential for abuse and diversion.

Dosage

In various aspects a composition of the invention comprises multiple active agents at the same or different dosages. In some embodiments, the analgesic components may vary in dosages as further described herein, and the antihistamine or antiemetic dosage can be adjusted according to the particular analgesics used.

For example, in various embodiments an opioid analgesic present in a composition of the invention is at a dose of 1.0 mg to about 20 mg, including but not limited to 1.0 mg, 1.5 mg, 2.5 mg, 3.0 mg, 4.0 mg, 5.0 mg, 6.0 mg, 6.5 mg, 7.0 mg, 7.5 mg, 8.0 mg, 8.5 mg, 9.0 mg, 9.5 mg, 10.0, 10.5 mg, 11.0 mg, 12.0 mg, 12.5 mg, 13.0 mg, 13.5 mg, 14.0 mg, 14.5 mg, 15.0 mg, 15.5 mg, 16 mg, 16.5 mg, 17 mg, 17.5 mg, 18 mg, 18.5 mg, 19 mg, 19.5 mg or 20 mg.

In further embodiments for multi-drug compositions of the invention a non-opioid analgesic is present at a doses of 200 mg to about 600 mg, including but not limited to 200 mg, 225 mg, 250 mg, 275 mg, 300 mg, 325 mg, 350 mg, 375 mg, 400 mg, 425 mg, 450 mg, 475 mg, 500 mg, 525 mg, 550 mg, 575 mg, 600 mg.

In yet further embodiments of the invention, an antiemetic or antihistamine component of a multi-drug composition of the invention is present at a dose of 0.5 mg to about 60 mg of promethazine, including but not limited to 0.5 mg, 1.0 mg, 1.5 mg, 2.0 mg, 2.5 mg, 3.0 mg, 3.5 mg, 4.0 mg, 4.5 mg, 5.0 mg, 5.5 mg, 6.0 mg, 6.5 mg, 7.0 mg, 7.5 mg, 8.0 mg, 8.5 mg, 9.0 mg, 9.5 mg, 10 mg, 10.5 mg, 11 mg, 11.5 mg, 12.0 mg, 12.5 mg, 13.0 mg, 13.5 mg, 14.0 mg, 14.5 mg, 15.0 mg, 15.5 mg, 16 mg, 16.5 mg, 17 mg, 17.5 mg, 18 mg, 18.5 mg, 19 mg, 19.5 mg or 20 mg, 25 mg, 30 mg, 35 mg, 40 mg, 45 mg, 50 mg, 55 mg or 60 mg.

In one embodiment, a composition of the invention comprises hydrocodone, a pharmaceutically acceptable salt or its thiosemicarbazone, p-nitrophenylhydrazone, o-methyloxime, semicarbazone, or bis(methylcarbamate) (each of the foregoing being a hydrocodone agent or derivative); acetaminophen; and promethazine. Furthermore, the hydrocodone agent is present in a range of about 1.0 mg to about 20 mg, including but not limited to 1.0 mg, 1.5 mg, 2.5 mg, 3.0 mg, 4.0 mg, 5.0 mg, 6.0 mg, 6.5 mg, 7.0 mg, 7.5 mg, 8.0 mg, 8.5 mg, 9.0 mg, 9.5 mg, 10.0, 10.5 mg, 11.0 mg, 12.0 mg, 12.5 mg, 13.0 mg, 13.5 mg, 14.0 mg, 14.5 mg, 15.0 mg, 15.5 mg, 16 mg, 16.5 mg, 17 mg, 17.5 mg, 18 mg, 18.5 mg, 19 mg, 19.5 mg or 20 mg. Furthermore, the acetaminophen is in a range of about 200 mg to about 600 mg, including but not limited to 200 mg, 225 mg, 250 mg, 275 mg, 300 mg, 325 mg, 350 mg, 375 mg, 400 mg, 425 mg, 450 mg, 475 mg, 500 mg, 525 mg, 550 mg, 575 mg, 600 mg. In addition, the promethazine is between about 0.5 mg to about 60 mg, including but not limited to 0.5 mg, 1.0 mg, 1.5 mg, 2.0 mg, 2.5 mg, 3.0 mg, 3.5 mg, 4.0 mg, 4.5 mg, 5.0 mg, 5.5 mg, 6.0 mg, 6.5 mg, 7.0 mg, 7.5 mg, 8.0 mg, 8.5 mg, 9.0 mg, 9.5 mg, 10 mg, 10.5 mg, 11 mg, 11.5 mg, 12.0 mg, 12.5 mg, 13.0 mg, 13.5 mg, 14.0 mg, 14.5 mg, 15.0 mg, 15.5 mg, 16 mg, 16.5 mg, 17 mg, 17.5 mg, 18 mg, 18.5 mg, 19 mg, 19.5 mg or 20 mg, 25 mg, 30 mg, 35 mg, 40 mg, 45 mg, 50 mg, 55 mg or 60 mg.

In various embodiments, a composition of the invention comprises hydrocodone, acetaminophen and promethazine, wherein the composition comprises the respective agents in a ratio of about (1 to 2):(40 to 45):(1 to 2), such as about 1:40:1, 1:40:1.1, 1:40:1.2, 1:40:1.3, 1:40:1.4, 1:40:1.5, 1:40:1.6, 1:40:1.7, 1:40:1.8, 1:40:1.9, 1:40:2, 1.1:40:1, 1.2:40:1, 1.3:40:1, 1.4:40:1, 1.5:40:1, 1.6:40:1, 1.7:40:1, 1.8:40:1, 1.9:40:1, 2:40:1, 1:41:1, 1:41:1.1, 1:41:1.2, 1:41:1.3, 1:41:1.4, 1:41:1.5, 1:41:1.6, 1:41:1.7, 1:41:1.8, 1:41:1.9, 1:41:2, 1.1:41:1, 1.2:41:1, 1.3:41:1, 1.4:41:1, 1.5:41:1, 1.6:41:1, 1.7:41:1, 1.8:41:1, 1.9:41:1, 2:41:1, 1:42:1, 1:42:1.1, 1:42:1.2, 1:42:1.3, 1:42:1.4, 1:42:1.5, 1:42:1.6, 1:42:1.7, 1:42:1.8, 1:42:1.9, 1:42:2, 1.1:42:1, 1.2:42:1, 1.3:42:1, 1.4:42:1, 1.5:42:1, 1.6:42:1, 1.7:42:1, 1.8:42:1, 1.9:42:1, 2:42:1, 1:43:1, 1:43:1.1, 1:43:1.2, 1:43:1.3, 1:43:1.4, 1:43:1.5, 1:43:1.6, 1:43:1.7, 1:43:1.8, 1:43:1.9, 1:43:2, 1.1:43:1, 1.2:43:1, 1.3:43:1, 1.4:43:1, 1.5:43:1, 1.6:43:1, 1.7:43:1, 1.8:43:1, 1.9:43:1, 2:43:1, 1:43.1:1, 1:43.1:1.1, 1:43.1:1.2, 1:43.1:1.3, 1:43.1:1.4, 1:43.1:1.5, 1:43.1:1.6, 1:43.1:1.7, 1:43.1:1.8, 1:43.1:1.9, 1:43.1:2, 1.1:43.1:1, 1.2:43.1:1, 1.3:43.1:1, 1.4:43.1:1, 1.5:43.1:1, 1.6:43.1:1, 1.7:43.1:1, 1.8:43.1:1, 1.9:43.1:1, 2:43.1:1, 1:43.2:1, 1:43.2:1.1, 1:43.2:1.2, 1:43.2:1.3, 1:43.2:1.4, 1:43.2:1.5, 1:43.2:1.6, 1:43.2:1.7, 1:43.2:1.8, 1:43.2:1.9, 1:43.2:2, 1.1:43.2:1, 1.2:43.2:1, 1.3:43.2:1, 1.4:43.2:1, 1.5:43.2:1, 1.6:43.2:1, 1.7:43.2:1, 1.8:43.2:1, 1.9:43.2:1, 2:43.2:1, 1:43.3:1, 1:43.3:1.1, 1:43.3:1.2, 1:43.3:1.3, 1:43.3:1.4, 1:43.3:1.5, 1:43.3:1.6, 1:43.3:1.7, 1:43.3:1.8, 1:43.3:1.9, 1:43.3:2, 1.1:43.3:1, 1.2:43.3:1, 1.3:43.3:1, 1.4:43.3:1, 1.5:43.3:1, 1.6:43.3:1, 1.7:43.3:1, 1.8:43.3:1, 1.9:43.3:1, 2:43.3:1, 1:43.4:1, 1:43.4:1.1, 1:43.4:1.2, 1:43.4:1.3, 1:43.4:1.4, 1:43.4:1.5, 1:43.4:1.6, 1:43.4:1.7, 1:43.4:1.8, 1:43.4:1.9, 1:43.4:2, 1.1:43.4:1, 1.2:43.4:1, 1.3:43.4:1, 1.4:43.4:1, 1.5:43.4:1, 1.6:43.4:1, 1.7:43.4:1, 1.8:43.4:1, 1.9:43.4:1, 2:43.4:1, 1:43.5:1, 1:43.5:1.1, 1:43.5:1.2, 1:43.5:1.3, 1:43.5:1.4, 1:43.5:1.5, 1:43.5:1.6, 1:43.5:1.7, 1:43.5:1.8, 1:43.5:1.9, 1:43.5:2, 1.1:43.5:1, 1.2:43.5:1, 1.3:43.5:1, 1.4:43.5:1, 1.5:43.5:1, 1.6:43.5:1, 1.7:43.5:1, 1.8:43.5:1, 1.9:43.5:1, 2:43.5:1, 1:43.6:1, 1:43.6:1.1, 1:43.6:1.2, 1:43.6:1.3, 1:43.6:1.4, 1:43.6:1.5, 1:43.6:1.6, 1:43.6:1.7, 1:43.6:1.8, 1:43.6:1.9, 1:43.6:2, 1.1:43.6:1, 1.2:43.6:1, 1.3:43.6:1, 1.4:43.6:1, 1.5:43.6:1, 1.6:43.6:1, 1.7:43.6:1, 1.8:43.6:1, 1.9:43.6:1, 2:43.6:1, 1:43.7:1, 1:43.7:1.1, 1:43.7:1.2, 1:43.7:1.3, 1:43.7:1.4, 1:43.7:1.5, 1:43.7:1.6, 1:43.7:1.7, 1:43.7:1.8, 1:43.7:1.9, 1:43.7:2, 1.1:43.7:1, 1.2:43.7:1, 1.3:43.7:1, 1.4:433:1, 1.5:43.7:1, 1.6:43.7:1, 1.7:43.7:1, 1.8:43.7:1, 1.9:43.7:1, 2:43.7:1, 1:43.8:1, 1:43.8:1.1, 1:43.8:1.2, 1:43.8:1.3, 1:43.8:1.4, 1:43.8:1.5, 1:43.8:1.6, 1:43.8:1.7, 1:43.8:1.8, 1:43.8:1.9, 1:43.8:2, 1.1:43.8:1, 1.2:43.8:1, 1.3:43.8:1, 1.4:43.8:1, 1.5:43.8:1, 1.6:43.8:1, 1.7:43.8:1, 1.8:43.8:1, 1.9:43.8:1, 2:43.8:1, 1:43.9:1, 1:43.9:1.1, 1:43.9:1.2, 1:43.9:1.3, 1:43.9:1.4, 1:43.9:1.5, 1:43.9:1.6, 1:43.9:1.7, 1:43.9:1.8, 1:43.9:1.9, 1:43.9:2, 1.1:43.9:1, 1.2:43.9:1, 1.3:43.9:1, 1.4:43.9:1, 1.5:43.9:1, 1.6:43.9:1, 1.7:43.9:1, 1.8:43.9:1, 1.9:43.9:1, 2:43.9:1, 1:44:1, 1:44:1.1, 1:44:1.2, 1:44:1.3, 1:44:1.4, 1:44:1.5, 1:44:1.6, 1:44:1.7, 1:44:1.8, 1:44:1.9, 1:44:2, 1.1:44:1, 1.2:44:1, 1.3:44:1, 1.4:44:1, 1.5:44:1, 1.6:44:1, 1.7:44:1, 1.8:44:1, 1.9:44:1, 2:44:1, 1:45:1, 1:45:1.1, 1:45:1.2, 1:45:1.3, 1:45:1.4, 1:45:1.5, 1:45:1.6, 1:45:1.7, 1:45:1.8, 1:45:1.9, 1:45:2, 1.1:45:1, 1.2:45:1, 1.3:45:1, 1.4:45:1, 1.5:45:1, 1.6:45:1, 1.7:45:1, 1.8:45:1, 1.9:45:1, or 2:45:1. For example, in one embodiment, the ratio of amounts for each active agent is (1): (43.33):(1.67) for hydrocodone, acetaminophen and promethazine, respectively.

In another embodiment, the pharmaceutical composition comprises oxycodone, a pharmaceutically acceptable salt or its thiosemicarbazone, p-nitrophenylhydrazone, o-methyloxime, semicarbazone, or bis(methylcarbamate) (each of the foregoing being a hydrocodone agent or derivative); acetaminophen; and promethazine. Furthermore the oxycodone agent is present in a range of about 1 mg to about 200 mg, including but not limited to 1.0 mg, 1.5 mg, 2.5 mg, 3.0 mg, 4.0 mg, 4.5 mg, 5.0 mg, 5.5 mg, 6.0 mg, 6.5 mg, 7.0 mg, 7.5 mg, 8.0 mg, 8.5 mg, 9.0 mg, 9.5 mg, 10.0, 10.5 mg, 11.0 mg, 12.0 mg, 12.5 mg, 13.0 mg, 13.5 mg, 14.0 mg, 14.5 mg, 15.0 mg, 15.5 mg, 16 mg, 16.5 mg, 17 mg, 17.5 mg, 18 mg, 18.5 mg, 19 mg, 19.5 mg or 20 mg, 30 mg, 40 mg, 50 mg, 70 mg, 100 mg, 130 mg, 160, 190 mg, 200 mg. Furthermore, the acetaminophen is in a range of between about 200 mg to about 600 mg, including but not limited to 200 mg, 225 mg, 250 mg, 275 mg, 300 mg, 325 mg, 350 mg, 375 mg, 400 mg, 425 mg, 450 mg, 475 mg, 500 mg, 525 mg, 550 mg, 575 mg, 600 mg, and a preferred range of about 325 mg. The pharmaceutical composition further comprises between about 0.5 mg to about 60 mg of an antihistamine (e.g., promethazine), including but not limited to 0.5 mg, 1.0 mg, 1.5 mg, 2.0 mg, 2.5 mg, 3.0 mg, 3.5 mg, 4.0 mg, 4.5 mg, 5.0 mg, 5.5 mg, 6.0 mg, 6.5 mg, 7.0 mg, 7.5 mg, 8.0 mg, 8.5 mg, 9.0 mg, 9.5 mg, 10 mg, 10.5 mg, 11.0 mg, 11.5 mg, 12.0 mg, 12.5 mg, 15 mg, 20 mg, 30 mg, 40 mg, 50 mg, or 60 mg.

In one embodiment, the pharmaceutical composition provides promethazine at 12.5 mg. In one embodiment, a composition of the invention comprises oxycodone, acetaminophen and promethazine, wherein the composition comprises the agents in a ratio of about (1 to 2): (40 to 45):(1 to 2), respectively. For example, in one embodiment, the ratio of amounts for each active agent is (1):(43.33):(1.67) for oxycodone, acetaminophen and promethazine, respectively. In one embodiment, a pharmaceutical composition of the invention comprises an antihistamine (e.g., promethazine) at a lower dosage than that which the antihistamine is administered alone. For example, the antihistamine is provided in the composition at a dosage to prevent sedation, which may be observed with relatively higher dosages of promethazine. Thus in some embodiments, promethazine is provided at 1, 2, 3, 4, 5, 5.5., 6, 6.5, 7, 7.5, 8, 8.5, 9, 9.5, 10, 10.5, 11, 11.5, 12, 12.5, 13, 13.5, 14, 14.5, 15, 15.5, 16, 16.5, 17, 17.5, 18, 18.5, 19, 19.5, 20, 20.5, 21, 21.5, 22, 22.5, 23, 23.5, 24, 24.5, 25, 25.5, 26, 26.5, 27, 27.5, 28, 28.5, 29, 29.5, 30, 30.5, 31, 31.5, 32, 33, 33.5, 34, 34.5, 35, 36, 36.5, 37, 37.5, 38, 38.5, 39, 39.5, 40, 40.5, 41, 41.5, 42, 42.5, 43, 43.5, 44, 44.5, 45, 45.5, 46, 46.5, 47, 47.5, 48, 48.5, 49, 49.5 or 50. Therefore, an antihistamine or antiemetic (e.g., promethazine) can be provided at a dosage that is effective in reducing adverse affects associated with the opioid analgesic and/or non-opioid analgesic, but is at a relative low enough dosage (e.g., given the subject's weight) to prevent sedation associated with the antihistamine/antiemetic. Examples of adverse effects include acute liver toxicity, allergic reactions such as swelling, difficulty breathing, closing of throat, abdominal pain, nausea, unusual bleeding or bruising.

In one embodiment, a pharmaceutical composition of the invention comprises 6-8 mg of hydrocodone (such as about 6.0 mg, 6.1 mg, 6.2 mg, 6.3 mg, 6.4 mg, 6.5 mg, 6.6 mg, 6.7 mg, 6.8 mg, 6.9 mg, 7.0 mg, 7.1 mg, 7.2 mg, 7.3 mg, 7.4 mg, 7.5 mg, 7.6 mg, 7.7 mg, 7.8 mg, 7.9 mg, or 8.0 mg,), 310-330 mg of acetaminophen (such as about 310 mg, 315 mg, 320 mg, or 325 mg), and 5-13 mg of promethazine (such as about 10 mg, 10.5 mg, 11.0 mg, 11.5 mg, 12.0 mg, 12.5 mg, 13.0 mg, 13.5 mg, 14.0 mg, 14.5 mg, or 15 mg). The hydrocodone and the acetaminophen can be formulated using conventional technologies to provide for an extended time release over a desired dosage interval. All or some of the promethazine is formulated for immediate release to help abate common adverse effects associated with the hydrocodone and/or acetaminophen including nausea, vomiting, other gastric upsets, skin rashes, allergic reactions such as swelling, difficulty breathing, closing of throat, abdominal pain, unusual bleeding or bruising.

In one embodiment, a composition of the invention comprises from 1% to 20% by weight of an antihistamine (such as 1%, 1.5%, 2%, 2.5%, 3%, 3.5%, 4%, 4.5%, 5%, 5.5%, 6%, 6.5%, 7%, 7.5%, 8%, 8.5%, 9%, 9.5%, 10%, 10.5%, 11%, 11.5%, 12%, 12.5%, 13%, 13.5%, 14%, 14.5%, 15%, 15.5%, 16%, 16.5%, 17%, 17.5%, 18%, 18.5%, 19%, 19.5%, or 20%); from 10% to 80% by weight a non-opioid analgesic (such as 10%, 10.5%, 11%, 11.5%, 12%, 12.5%, 13%, 13.5%, 14%, 14.5%, 15%, 15.5%, 16%, 16.5%, 17%, 17.5%, 18%, 18.5%, 19%, 19.5%, 20%, 20.5%, 21%, 21.5%, 22%, 22.5%, 23%, 23.5%, 24%, 24.5%, 25%, 25.5%, 26%, 26.5%, 27%, 27.5%, 28%, 28.5%, 29%, 29.5%, 30%, 30.5%, 31%, 31.5%, 32%, 32.5%, 33%, 33.5%, 34%, 34.5%, 35%, 35.5%, 36%, 36.5%, 37%, 37.5%, 38%, 38.5%, 39%, 39.5%, 40%, 40.5%, 41%, 41.5%, 42%, 42.5%, 43%, 43.5%, 44%, 44.5%, 45%, 45.5%, 46%, 46.5%, 47%, 47.5%, 48%, 48.5%, 49%, 49.5%, 50%, 50.5%, 51%, 51.5%, 52%, 52.5%, 53%, 53.5%, 54%, 54.5%, 55%, 55.5%, 56%, 56.5%, 57%, 57.5%, 58%, 58.5%, 59%, 59.5%, 60%, 60.5%, 61%, 61.5%, 62%, 62.5%, 63%, 63.5%, 64%, 64.5%, 65%, 65.5%, 66%, 66.5%, 67%, 67.5%, 68%, 68.5%, 69%, 69.5%, 70%, 70.5%, 71%, 71.5%, 72%, 72.5%, 73%, 73.5%, 74%, 74.5%, 75%, 75.5%, 76%, 76.5%, 77%, 77.5%, 78%, 78.5%, 79%, 79.5%, 80%); and from 1% to 20% by weight of an opioid analgesic (such as 1%, 1.5%, 2%, 2.5%, 3%, 3.5%, 4%, 4.5%, 5%, 5.5%, 6%, 6.5%, 7%, 7.5%, 8%, 8.5%, 9%, 9.5%, 10%, 10.5%, 11%, 11.5%, 12%, 12.5%, 13%, 13.5%, 14%, 14.5%, 15%, 15.5%, 16%, 16.5%, 17%, 17.5%, 18%, 18.5%, 19%, 19.5%, or 20%).

In one embodiment, a composition of the invention comprises 6-8 mg of oxycodone HCl (such as about 7.5 mg), 310-330 mg of acetaminophen (such as about 325 mg), and 6-8 mg of promethazine (such as about 12.5 mg). The oxycodone HCl and the acetaminophen can be formulated using conventional technologies to provide for an extended time release over a desired dosage interval. All or some of the promethazine is formulated for immediate release. Therefore, in one embodiment, administration of a composition of the invention comprising such a promethazine active agent can result in reduced, abated or eliminated adverse effects associated with the oxycodone HCl and/or acetaminophen. Reduced, abated or eliminated adverse effects include but are not limited to including nausea, vomiting, other gastric upsets, skin rashes, allergic reactions such as swelling, difficulty breathing, closing of throat, abdominal pain, unusual bleeding or bruising or any combination thereof.

The dosages and concentrations of active agents in the compositions may be varied as desired, as further described herein. Depending on the subject and/or condition being treated and on the administration route, the active agent in a composition can generally be administered in dosages of 0.01 mg to 500 mg V/kg body weight per day, e.g. about 20 mg/day for an average person. The dosage can be adjusted based on the mode of administration. A typical dosage may be one administration daily, or multiple administrations daily.

Of course for prolonged or controlled-release dosage forms (e.g., patches) the unit dose is designed for administration over a defined period of time. In some embodiments, dosage for one or a combination of agents can be from 0.01 to 5 mg, 1 to 10 mg, 5 to 20 mg, 10 to 50 mg, 20 to 100 mg, 50 to 150 mg, 100 to 250 mg, 150 to 300 mg, 250 to 500 mg, 300 to 600 mg or 500 to 1000 mg V/kg body weight. Dose levels can vary as a function of the specific compound, the severity of the symptoms and the susceptibility of the subject to adverse effects.

Routes of Administration

In various embodiments of the present invention, the active agents are formulated to be administered through oral dosage forms (e.g., tablets, capsules, gels), inhalations, nasal sprays, patches, absorbing gels, liquids, liquid tannates, suppositories, injections, I.V. drips, other delivery methods, or a combination thereof to treat subjects. Administration may be performed in a variety of ways, including, but not limited to orally, subcutaneously, intravenously, intranasally, intraotically, transdermally, topically (e.g., gels, salves, lotions, creams, etc.), intraperitoneally, intramuscularly, intrapulmonary (e.g., AERx® inhalable technology commercially available from Aradigm, or Inhance, pulmonary delivery system commercially available from Inhale Therapeutics), vaginally, parenterally, rectally, or intraocularly.

To prepare the present compositions, the active agents can be mixed with a suitable pharmaceutically acceptable carrier. Upon mixing of the compounds, the resulting composition can be a solid, a half-solid, a solution, suspension, or an emulsion. Such compositions can be prepared according to methods known to those skilled in the art. The forms of the resulting compositions can depend upon a variety of factors, including the intended mode of administration and the solubility of the compounds in the selected carrier or vehicle. The effective concentration of analgesics is sufficient for lessening or alleviating pain. In one embodiment of the invention, the components of the present compositions are at least one opioid analgesic agent (e.g., hydrocodone/oxycodone), one non-opioid analgesic agent (e.g., acetaminophen), and one antihistamine agent (e.g., promethazine). In other embodiments, administration comprises administration of an antihistamine (e.g., promethazine) separately, prior to, or during administration of the analgesic formulations described herein (e.g., which comprises hydrocodone and acetaminophen).

The agents of the compositions and methods of the present invention can be administered by the nasal inhalation route using conventional nebulizers or by oxygen aerosolization to provide convenient pain relief with reduced adverse effects. The agents can be suspended or dissolved in a pharmacologically acceptable inhalation carrier. Examples of such carriers are distilled water, water/ethanol mixtures, and physiological saline solution. Conventional additives including sodium chloride, glucose, citric acid and the like may be employed in these dosage forms to stabilize or to provide isotonic media. In one embodiment of the invention, the compositions suitable for nasal inhalation by oxygen aerosolization administration comprise hydrocodone or oxycodone, acetaminophen, and promethazine. In other embodiments, an antihistamine (e.g., promethazine) can be administered separately, prior to, or during administration of the compositions described herein (e.g., those comprising hydrocodone and acetaminophen).

The agents of the present invention can also be administered as a self-propelled dosage unit in aerosol form suitable for inhalation therapy. Suitable means for employing the aerosol inhalation therapy technique are described, for example, in U.S. Pat. No. 6,913,768 to Couch et al., incorporated herein by reference in its entirety. The agent can be suspended in an inert propellant such as a mixture of dichlorodifluoromethane and dichlorotetrafluoroethane, together with a co-solvent such as ethanol, together with other medications such as albuterol, together with flavoring materials and stabilizers. In one embodiment of the invention, the agents useful for a self-propelled dosage unit in aerosol form administration are hydrocodone or oxycodone, acetaminophen, and promethazine.

The agents of the compositions and methods of the present invention can also be administered as nasal spray/drop compositions, which can conveniently and safely be applied to subjects to effectively treat pain with reduced adverse effects. The compositions may further comprise a water soluble polymer such as polyvinylpyrrolidone, together with other medications such as sumatriptan, together with bioadhesive material. In one embodiment of the invention, the components of a composition for nasal spray or drop administration are hydrocodone or oxycodone agent, acetaminophen, and promethazine.

The compositions of the present invention can also be administered topically to the skin of a subject. The agents can be mixed with a pharmaceutically acceptable carrier or a base which is suitable for topical application to skin to form a dermatological composition. Suitable examples of carrier or base include, but not limited to, water, glycols, alcohols, lotions, creams, gels, emulsions, and sprays. A dermatological composition comprising an analgesic agent can be integrated into a topical dressing, medicated tape, dermal patch absorbing gel and cleansing tissues. In one embodiment of the invention, the dermatological composition comprises hydrocodone or oxycodone, acetaminophen, and promethazine.

The compositions of the present invention can also be in liquid or liquid tannate form. The liquid formulations can comprise, for example, an agent in water-in-solution and/or suspension form; and a vehicle comprising polyethoxylated castor oil, alcohol and/or a polyoxyethylated sorbitan mono-oleate with or without flavoring. Each dosage form comprises an effective amount of an active agent and can optionally comprise pharmaceutically inert agents, such as conventional excipients, vehicles, fillers, binders, disentegrants, solvents, solubilizing agents, sweeteners, coloring agents and any other inactive agents that can be included in pharmaceutical dosage forms for oral administration. Examples of such vehicles and additives can be found in Remington's Pharmaceutical Sciences, 17th edition (1985). Therefore, in one embodiment a liquid composition of the invention comprises an opioid analgesic (e.g., hydrocodone or oxycodone), a non-opioid analgesic (e.g., acetaminophen) and an antihistamine (e.g., promethazine).

The compositions of the present invention can also be administered in a suppository form, comprising an outer layer containing the composition in a suppository base. The suppository base may, for example, be any conventional suppository base material such as glycogelatin, polyethylene glycol, fractionated palm kernel oil, or one or more natural, synthetic or semisynthetic hard fats such as cocoa butter. Therefore, in one embodiment of the invention, the base material is mixed with an opioid analgesic (e.g., hydrocodone/oxycodone), a non-opioid analgesic (e.g., acetaminophen) and an antihistamine (e.g., promethazine).

The compositions of the present invention can also be administered in injection-ready stable liquids for injection or I.V. drip. For example, saline or other injection-ready liquid can be mixed with an opioid analgesic (e.g., hydrocodone or oxycodone), a non-opioid analgesic (e.g., acetaminophen) and an antihistamine (e.g., promethazine).

Dosage Forms

In various embodiments of the invention, a composition is in one or more dosage form. For example, a composition can be administered in a solid or liquid form. Examples of solid dosage forms include but are not limited to discrete units in capsules or tablets, as a powder or granule, or present in a tablet conventionally formed by compression molding. Such compressed tablets may be prepared by compressing in a suitable machine the three or more agents and a pharmaceutically acceptable carrier. The molded tablets can be optionally coated or scored, having indicia inscribed thereon and can be so formulated as to cause immediate, substantially immediate, slow, or controlled release of the hydrocodone and/or the acetaminophen. Furthermore, dosage forms of the invention can comprise acceptable carriers or salts known in the art, such as those described in the Handbook of Pharmaceutical Excipients, American Pharmaceutical Association (1986), incorporated by reference herein.

In one embodiment, the components are mixed with a pharmaceutical excipient to form a solid preformulation composition comprising a homogeneous mixture of compounds of the present invention. When referring to these compositions as “homogeneous”, it is meant that the agents are dispersed evenly throughout the composition so that the composition can be subdivided into unit dosage forms such as tablets or capsules. This solid preformulation composition can then subdivided into unit dosage forms of the type described above comprising from, for example, about 1.0 mg to about 15 mg of an opioid, such as hydrocodone or oxycodone of the present invention.

The compositions can be formulated, in the case of capsules or tablets, to be swallowed whole, for example with water. The inclusion of the side-effect-reducing agent such as an antihistamine or antiemetic to abate common symptoms of nausea and vomiting are believed beneficial in that promethazine or the like will eliminate or minimize the amount of discomfort. Adverse effects reduced or eliminated include but are not limited to nausea, vomiting, other gastric upsets, skin rashes, allergic reactions such as swelling, difficulty breathing, closing of throat, abdominal pain, unusual bleeding or bruising.

Frequently, subjects taking opioids have adverse effects including vomiting that can occur shortly after taking a first or subsequent dose. As a consequence, a portion of the opioid dose is subsequently lost, making it difficult to accurately gauge replacement dosages for the subject, and for subjects outside of a hospital or clinic environment, there might not be any alternative form of pain medication readily available. As a consequence, subjects experiencing gastric discomfort such as vomiting will lack the beneficial effects of the opioid analgesic and experience the additional discomfort and enhanced pain associated with vomiting. This problem is solved by also administering promethazine, which reduces side-effects.

The dosage forms of the present invention can be manufactured using processes that are well known to those of skill in the art. For example, for the manufacture of bi-layered tablets, the agents can be dispersed uniformly in one or more excipients, for example, using high shear granulation, low shear granulation, fluid bed granulation, or by blending for direct compression. Excipients include diluents, binders, disintegrants, dispersants, lubricants, glidants, stabilizers, surfactants and colorants. Diluents, also termed “fillers”, can be used to increase the bulk of a tablet so that a practical size is provided for compression. Non-limiting examples of diluents include lactose, cellulose, microcrystalline cellulose, mannitol, dry starch, hydrolyzed starches, powdered sugar, talc, sodium chloride, silicon dioxide, titanium oxide, dicalcium phosphate dihydrate, calcium sulfate, calcium carbonate, alumina and kaolin. Binders can impart cohesive qualities to a tablet formulation and can be used to help a tablet remain intact after compression. Non-limiting examples of suitable binders include starch (including corn starch and pregelatinized starch), gelatin, sugars (e.g., glucose, dextrose, sucrose, lactose and sorbitol), celluloses, polyethylene glycol, waxes, natural and synthetic gums, e.g., acacia, tragacanth, sodium alginate, and synthetic polymers such as polymethacrylates and polyvinylpyrrolidone. Lubricants can also facilitate tablet manufacture; non-limiting examples thereof include magnesium stearate, calcium stearate, stearic acid, glyceryl behenate, and polyethylene glycol. Disintegrants can facilitate tablet disintegration after administration, and non-limiting examples thereof include starches, alginic acid, crosslinked polymers such as, e.g., crosslinked polyvinylpyrrolidone, croscarmellose sodium, potassium or sodium starch glycolate, clays, celluloses, starches, gums and the like. Non-limiting examples of suitable glidants include silicon dioxide, talc and the like. Stabilizers can inhibit or retard drug decomposition reactions, including oxidative reactions. Surfactants can also included and can be anionic, cationic, amphoteric or nonionic. If desired, the tablets can also comprise nontoxic auxiliary substances such as pH buffering agents, preservatives, e.g., antioxidants, wetting or emulsifying agents, solubilizing agents, coating agents, flavoring agents, and the like.

Extended or controlled-release formulations can comprise one or more combination of excipients that slow the release of the agents by coating or temporarily bonding or decreasing their solubility of the active agents. Examples of these excipients include cellulose ethers such as hydroxypropylmethylcellulose (e.g., Methocel K4M), polyvinylacetate-based excipients such as, e.g., Kollidon SR, and polymers and copolymers based on methacrylates and methacrylic acid such as, e.g., Eudragit NE 30D. In one embodiment of the invention, the analgesic agents (e.g., hydrocodone or oxycodone, and acetaminophen) are formulated for extended or controlled-release while the promethazine is formulated for immediate release. In another embodiment, all agents are formulated for extended or controlled-release.

Pharmaceutical carriers or vehicles suitable for administration of the compounds provided herein include all such carriers known to those skilled in the art to be suitable for the particular mode of administration. In addition, the analgesics and promethazine can also be administered with other components that do not impair the desired action, or with components that supplement the desired action, or have another action. As noted above, a composition can comprise additional (e.g., a fourth, fifth, sixth, etc.) addition active compounds.

In one embodiment of the present invention, the composition comprises three or more active agents wherein at least one active agent is in immediate release form. In this embodiment the immediate-release form is included in an amount that is effective to shorten the time to its maximum concentration in the blood. By way of example, certain immediate-release pharmaceutical preparations are taught in United States Patent Publication US 2005/0147710A1 entitled, “Powder Compaction and Enrobing” which is incorporated herein in its entirety by reference.

In a further embodiment of the present invention, the component in immediate-release form is a component that reduces abates or eliminates and/or suppresses a adverse effect associated with one or more opioid analgesics.

For example, the immediate-release active can be an antihistamine or antiemetic, which reduces, abates or eliminates an adverse effect associated with opioid and/or non-opioid analgesics described herein. Thus, in one embodiment, of the invention, the analgesic formulation comprises an opioid and non-opioid analgesic (e.g., hydrocodone or oxycodone and acetaminophen, respectively) and an antihistamine (e.g., promethazine).

In a further embodiment of the present invention, all or less than all of the total amount of the antiemetic or antihistamine agent is formulated in immediate-release form, as described herein.

A variety of known methods and materials may be used to bring about the immediate release. For instance, placement of the agent along an exterior of a tablet (e.g., coating the exterior or formulating the outer layer with the agent) and/or combined with forming a tablet by compressing the powder using low compaction can produce immediate-release of the agent from the composition.

In a specific embodiment, an effective amount of the promethazine in immediate-release form may be coated onto a substrate. For example, where the extended release of one or more analgesics from a formulation is due to a controlled-release coating, an immediate-release layer comprising promethazine can overcoat the controlled-release coating. On the other hand, the immediate-release layer of promethazine can be coated onto the surface of a substrate wherein hydrocodone and/or oxycodone is incorporated in a controlled release matrix. Where a plurality of controlled-release substrates comprising an effective unit dose of an analgesic (e.g., multiparticulate systems including pellets, spheres, beads and the like) are incorporated into a hard gelatin capsule, the side-effect-reducing compound can be incorporated into the gelatin capsule via inclusion of an amount of immediate-release promethazine as a powder or granulate within the capsule. Alternatively, the gelatin capsule itself can be coated with an immediate-release layer of promethazine. One skilled in the art recognizes still other alternative means of incorporating the immediate release side-effect-reducing compound into the unit dose. By including an effective amount of immediate-release side-effect-reducing compound such as promethazine in the unit dose, the experience of adverse effects including nausea, vomiting, other gastric upsets, skin rashes, allergic reactions such as swelling, difficulty breathing, closing of throat, abdominal pain, unusual bleeding or bruising and skin rashes in subjects can be significantly reduced.

In one embodiment of the present invention, the composition comprises three or more active agents wherein at least one active agent is in controlled-release form. The controlled-release form can be in an amount that is effective to protect the agent from rapid elimination from the body. Certain preparations relating to the controlled release of a pharmaceutical are taught in United States Patent Publication US 2005/0147710A1 entitled, “Powder Compaction and Enrobing” which is incorporated herein in its entirety by reference.

In a further embodiment of the present invention, the agent in controlled-release form is an opioid analgesics such as, for example, hydrocodone, or oxycodone. In one embodiment of the invention, compositions comprise one or more carriers that protect the agents against rapid elimination from the body, such as time-release formulations or coatings. Such carriers include controlled-release formulations, including, for example, microencapsulated delivery systems. The active agents can be included in the pharmaceutically acceptable carrier in amounts sufficient to treat a subject's pain, with reduced adverse effects.

In certain embodiments the compositions are in oral-dosage form and comprise a matrix that includes, for example, a controlled-release material and an analgesic such as hydrocodone or a pharmaceutically acceptable salt thereof. In certain embodiments, the matrix is compressible into a tablet and can be optionally overcoated with a coating that can control the release of the analgesics including hydrocodone or pharmaceutically acceptable salt thereof from the composition. In this embodiment blood levels of analgesics are maintained within a therapeutic range over an extended period of time. In certain alternate embodiments, the matrix is encapsulated.

Tablets or capsules containing a composition of the present invention can be coated or otherwise compounded to provide a dosage form affording the advantage of prolonged action. For example, the tablet or capsule can contain an inner dosage and an outer dosage component, the latter being in the form of an envelope over the former. The two components can be separated by an enteric layer that serves to resist disintegration in the stomach and permit the inner component to pass intact into the duodenum or to be delayed in release. For controlled extended release, the capsule can also have micro drilled holes.

A coating comprising a side-effect-reducing compound such as promethazine, in immediate release form, can be added to the outside of a controlled-release tablet core to produce a final dosage form. Such a coating can be prepared by admixing a compound like promethazine with polyvinylpyrrolidone (PVP) 29/32 or hydroxypropyl methylcellulose (HPMC) and water/isopropyl alcohol and triethyl acetate. Such an immediate-release coating can be spray coated onto the tablet cores. The immediate-release coating can also be applied using a press-coating process with a blend consisting of 80% by weight promethazine and 20% by weight of lactose and hydroxypropyl methylcellulose type 2910. Press-coating techniques are known in the art and are described in U.S. Pat. No. 6,372,254 to Ting et al., incorporated herein by reference in its entirety.

The immediate-release or controlled-release dosage forms of the present invention can also take the form of a bi-layered tablet, which comprises a first layer and a second layer. The first layer comprises a first drug selected from analgesics, antitussives, antihistamines, antiemetics. The second layer comprises a second drug selected from analgesics, antitussives, antihistamines, antiemetics. The second drug is the same as or different from the first drug. The bi-layered tablet can provide a plasma concentration within the therapeutic range of the second drug over a period which is coextensive with at least about 70% of the period (e.g., 12 hours) within which the bilayered tablet provides a plasma concentration within the therapeutic range of the first drug.

In a further aspect of the bi-layered tablet, the first layer is an immediate release layer and/or the second layer is a controlled-release layer.

In one aspect of the bi-layered tablet of the present invention, both layers can comprise an opioid analgesic such as hydrocodone or oxycodone; a non-opioid analgesic such as acetaminophen, and a compound, such as promethazine, to reduce or suppress adverse effects.

In a further aspect of the bi-layered tablet of the present invention, the first layer comprises promethazine and the second layer comprises hydrocodone or oxycodone. The first or second layer can further comprise acetaminophen.

In one embodiment of the present invention, the components are released from a multi-layered tablet that comprises a first layer and a second layer. In this embodiment the first layer comprises a first drug which is selected from analgesics, antitussives, antihistamines, antiemetics. The second layer comprises a second drug which is selected from analgesics, antitussives, antihistamines, antiemetics. The second drug can be the same as or different from the first drug. In one aspect of the multi-layered tablet, the second drug can have a plasma half-life that differs from the plasma half-life of the first drug by at least about 2 hours.

In a further aspect of the multi-layered tablet, the first layer is an immediate-release layer and/or the second layer is a controlled release layer.

In one embodiment of the multi-layered tablet of the present invention, both the first layer and the second layer can comprise an opioid analgesic such as hydrocodone or oxycodone; a non-opioid analgesic such as acetaminophen; and compound to reduce or suppress adverse effects such as promethazine.

In a further embodiment of the multi-layered tablet of the present invention, the first layer comprises promethazine and the second layer comprises hydrocodone or oxycodone. The first or second layer can further comprise acetaminophen.

The immediate-release or controlled release dosage forms of the present invention can also take the form of pharmaceutical particles manufactured by a variety of methods, including but not limited to high-pressure homogenization, wet or dry ball milling, or small particle precipitation (nGimat's NanoSpray^(SM)). Other methods to make a suitable powder formulation are the preparation of a solution of active ingredients and excipients, followed by precipitation, filtration, and pulverization, or followed by removal of the solvent by freeze-drying, followed by pulverization of the powder to the desired particle size. In one embodiment the pharmaceutical particles are manufactured to a final size of 3-1000 uM, such as at most 3, 4, 5, 6, 7, 8, 9,10, 20, 30, 40, 50, 60, 70, 80, 90, 100, 150, 200, 250, 300, 350, 400, 450, 500, 550, 600, 650, 700, 750, 800, 850, 900, 950, 1000 uM. In another embodiment the pharmaceutical particles are manufactured to a final size of 10-500 uM. embodiment the pharmaceutical particles are manufactured to a final size of 50-600 uM. embodiment the pharmaceutical particles are manufactured to a final size of 100-800 uM. These dosage forms can include immediate-release particles in combination with controlled-release particles in a ratio sufficient useful for delivering the desired dosages of active agents. For example, the immediate-release particles can comprise about 12.5 mg of promethazine, and the controlled-release particles can comprise about 7.5 mg of hydrocodone (or 7.5 mg of oxycodone) and about 325 mg of acetaminophen.

In another aspect of the present invention, the components are released from a multi-layered tablet that comprise at least a first layer, a second layer and a third layer. Wherein, the layers containing an agent (such as an opioid analgesic, a non-opioid analgesic and an antihistamine) can be optionally separated by one or more layers of inert materials. In one embodiment the layers containing an agent have similar rates of release, e.g. all are immediate release or all are controlled-release. In an alternative embodiment the layers have different rates of release. In this aspect at least one layer is an immediate release layer and at least one layer is a controlled release layer. For example in one embodiment the multilayer tablet comprises at least three layers, each of which contains a different agent, such as: layer one contains promethazine; layer two comprises hydrocodone or oxycodone; and layer three comprises acetaminophen. In this embodiment the promethazine layer may be designed for immediate-release, while the other two layers may be designed for controlled-release.

In another embodiment a composition comprising an opioid analgesic agent, a non-opioid analgesic agent and an antihistamine agent is administered to a subject. In this embodiment the antihistamine component can be formulated for immediate release or a controlled release which is faster than the release of the opioid analgesic agent and, optionally, the non-opioid analgesic agent. In one embodiment the composition comprises hydrocodone or oxycodone, acetaminophen and promethazine.

In another embodiment a composition comprising an opioid analgesic agent, a non-opioid analgesic agent and an antihistamine agent is administered to a subject; wherein the amounts and release rates of the opioid analgesic agent and the antihistamine agent are effective to reduce at least one side affect of opioid treatment in a subject. In one embodiment the composition comprises hydrocodone or oxycodone, acetaminophen and promethazine.

Additives

The present compositions can further comprise suitable additives, including, but not limited to, diluents, binders, surfactants, lubricants, glidants, coating materials, plasticizers, coloring agents, flavoring agents, or pharmaceutically inert materials. Examples of diluents include, for example, cellulose; cellulose derivatives such as microcrystalline cellulose and the like; starch; starch derivatives such as corn starch, cyclodextrin and the like; sugar; sugar alcohol such as lactose, D-mannitol and the like; inorganic diluents such as dried aluminum hydroxide gel, precipitated calcium carbonate, magnesium aluminometasilicate, dibasic calcium phosphate and the like.

Examples of binders include, for example, hydroxypropylcellulose, methylcellulose, hydroxypropylmethylcellulose, povidone, dextrin, pullulane, hydroxypropyl starch, polyvinyl alcohol, scacia, agar, gelatin, tragacanth, macrogol and the like.

Examples of surfactants include, for example, sucrose esters of fatty acids, polyoxyl stearate, polyoxyethylene hydrogenated castor oil, polyoxyethylene polyoxypropylene glycol, sorbitan sesquioleate, sorbitan trioleate, sorbitan monostearate, sorbitan monopalmitate, sorbitan monolaurate, polysorbate, glyceryl monostearate, sodium lauryl sulfate, lauromacrogol and the like.

Examples of lubricants include, for example, stearic acid, calcium stearate, magnesium stearate, talc and the like.

Examples of glidants include, for example, dried aluminium hydroxide gel, magnesium silicate and the like.

Examples of coating materials include, for example, hydroxypropylmethyl cellulose 2910, aminoalkyl methacrylate copolymer E, polyvinylacetal diethylaminoacetate, macrogol 6000, titanium oxide and the like. Examples of plasticizers include, for example, triethyl citrate, triacetin, macrogol 6000 and the like.

EXAMPLES Examples of Hydrocodone-Acetaminophen-Promethazine-containing Analgesics Example 1

Analgesic Composition A

Agents mg/Tablet

Hydrocodone Bitartrate  7.5 mg Acetaminophen 325 mg Promethazine 12.5 mg 

Example 2

The composition of Example 1 is orally administered with water to a subject having a tendency to exhibit adverse effects of gastric upset, nausea, vomiting, or skin rash. Such subjects, upon taking the composition set forth in Example 1 would receive a therapeutically effective amount of promethazine in their blood stream. The promethazine would reduce the adverse effects that such a target population would otherwise exhibit.

In another example, the dosage form is a bi-layered tablet, in which the first layer is an immediate-release layer comprising 12.5 mg of promethazine hydrochloride and the second layer is a controlled-release layer comprising 12.5 mg of promethazine hydrochloride, 15 mg of hydrocodone bitartrate, and 325 mg of acetaminophen.

Examples of Oxycodone Hydrochloride, Acetaminophen, Promethazine containing Analgesics

Example 3

Analgesic Composition B

Agents mg/Tablet

Oxycodone HCl  7.5 mg or 5 mg Acetaminophen  325 mg Promethazine 12.5 mg

Example 4

The composition of Example 3 is orally administered with water to a subject having a tendency to exhibit adverse effects of gastric upset, nausea, vomiting, or skin rash. Such subjects, upon taking the composition set forth in Example 3 would receive a therapeutically effective amount of promethazine which will reduce the adverse effects that such a target population would otherwise exhibit.

In one embodiment, the dosage form is a bi-layered tablet, in which the first layer is an immediate-release layer comprising 12.5 mg of promethazine hydrochloride, and the second layer is a controlled-release layer comprising 12.5 mg of promethazine hydrochloride, 15 mg of oxycodone HCl, and 325 mg of acetaminophen. 

What is claimed is:
 1. A bi-layer tablet comprising (a) an immediate-release layer that comprises promethazine or a pharmaceutically acceptable salt thereof; and (b) a controlled-release layer that comprises an opioid analgesic agent and a non-opioid analgesic agent, wherein the non-opioid analgesic agent is acetaminophen or a pharmaceutically acceptable salt thereof, wherein the opioid analgesic agent is hydrocodone, oxycodone, or a pharmaceutically acceptable salt thereof, wherein about 90% of the promethazine or a pharmaceutically acceptable salt thereof is released in about 1 minute to about 20 minutes following administration and about 100% of the promethazine or a pharmaceutically acceptable salt thereof is released within about 1 hour following administration, and wherein the hydrocodone, oxycodone, or a pharmaceutically acceptable salt thereof, is released within about 20 minutes to about 180 minutes following administration.
 2. The bi-layer tablet of claim 1, wherein the opioid analgesic agent is hydrocodone bitartrate or oxycodone hydrochloride.
 3. The bi-layer tablet of claim 1, comprising from 1% to 20% by weight of the promethazine or a pharmaceutically acceptable salt thereof; from 10% to 80% by weight of the acetaminophen or a pharmaceutically acceptable salt thereof; and from 1% to 20% by weight of the hydrocodone, oxycodone, or a pharmaceutically acceptable salt thereof.
 4. A method for alleviating an adverse effect associated with administration of an opioid analgesic agent to a subject, the method comprising administering to the subject a bi-layer tablet comprising: (a) an immediate-release layer that comprises promethazine or a pharmaceutically acceptable salt thereof; and (b) a controlled-release layer that comprises the opioid analgesic agent and a non-opioid analgesic agent, wherein the non-opioid analgesic agent is acetaminophen or a pharmaceutically acceptable salt thereof, wherein the opioid analgesic agent is hydrocodone, oxycodone, or a pharmaceutically acceptable salt thereof, wherein about 90% of the promethazine or a pharmaceutically acceptable salt thereof is released in about 1 minute to about 20 minutes following administration and about 100% of the promethazine or a pharmaceutically acceptable salt thereof is released within about 1 hour following administration, and wherein the hydrocodone, oxycodone, or a pharmaceutically acceptable salt thereof, is released within about 20 minutes to about 180 minutes following administration.
 5. A method for treating pain in a subject suffering from or susceptible to pain, the method comprising administering to the subject a bi-layer tablet comprising: (a) an immediate-release layer that comprises promethazine or a pharmaceutically acceptable salt thereof; and (b) a controlled-release layer that comprises an opioid analgesic agent and a non-opioid analgesic agent, wherein the non-opioid analgesic agent is acetaminophen or a pharmaceutically acceptable salt thereof, wherein the opioid analgesic agent is hydrocodone, oxycodone, or a pharmaceutically acceptable salt thereof, wherein about 90% of the promethazine or a pharmaceutically acceptable salt thereof is released in about 1 minute to about 20 minutes following administration and about 100% of the promethazine or a pharmaceutically acceptable salt thereof is released within about 1 hour following administration, and wherein the hydrocodone, oxycodone, or a pharmaceutically acceptable salt thereof, is released within about 20 minutes to about 180 minutes following administration.
 6. The bi-layer tablet of claim 1, wherein the opioid analgesic agent is the hydrocodone or a pharmaceutically acceptable salt thereof.
 7. The bi-layer tablet of claim 1, wherein the opioid analgesic agent is the oxycodone or a pharmaceutically acceptable salt thereof.
 8. The bi-layer tablet of claim 1, comprising from 5 to 13 mg of the promethazine or a pharmaceutically acceptable salt thereof, from 310 to 330 mg of the acetaminophen or a pharmaceutically acceptable salt thereof, and from 6 to 8 mg of the hydrocodone or a pharmaceutically acceptable salt thereof.
 9. The bi-layer tablet of claim 1, comprising about 12.5 mg of the promethazine or a pharmaceutically acceptable salt thereof, about 325 mg of the acetaminophen or a pharmaceutically acceptable salt thereof, and about 7.5 mg of the hydrocodone or a pharmaceutically acceptable salt thereof.
 10. The bi-layer tablet of claim 1, comprising the promethazine or a pharmaceutically acceptable salt thereof, the acetaminophen or a pharmaceutically acceptable salt thereof, and the hydrocodone or a pharmaceutically acceptable salt thereof in a mass ratio of about (1 to 2):(40 to 45):(1 to 2).
 11. The bi-layer tablet of claim 1, comprising the promethazine or a pharmaceutically acceptable salt thereof, the acetaminophen or a pharmaceutically acceptable salt thereof, and the hydrocodone or a pharmaceutically acceptable salt thereof in a mass ratio of about (1.67):(43.33):(1).
 12. The bi-layer tablet of claim 1, further comprising an opioid antagonist or an additional agent for reducing abuse and/or diversion.
 13. The bi-layer tablet of claim 12, wherein the opioid antagonist is nalmefene, naloxone, or naltrexone. 